Re: [Pals] draft-zzhang-intarea-generic-delivery-functions

Stewart Bryant <stewart.bryant@gmail.com> Mon, 22 February 2021 10:15 UTC

Return-Path: <stewart.bryant@gmail.com>
X-Original-To: pals@ietfa.amsl.com
Delivered-To: pals@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A12163A1245; Mon, 22 Feb 2021 02:15:03 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.097
X-Spam-Level:
X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no
Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com
Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CCm_TbUgpgQX; Mon, 22 Feb 2021 02:15:01 -0800 (PST)
Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 148573A1248; Mon, 22 Feb 2021 02:15:00 -0800 (PST)
Received: by mail-wm1-x330.google.com with SMTP id v62so13762797wmg.4; Mon, 22 Feb 2021 02:15:00 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:message-id:mime-version:subject:date:in-reply-to:cc:to :references; bh=rHInDh+vUSPUTwgrfIn+5wJ305zDq7/TptP6mQlkG5E=; b=c3LnNa9RvjHLWhowPabsXMYJg1+mUSvhxPBXKndaPCa4uVZD0xOksrqGu1UVJMQ8/4 IKWZBWF9TpSNFwadQZ2ukEQGFrwgvoaCl1ZCZgK8j84VTAgok28GnxJYU3kUFZNO2bbG ELoG8nPB7hJYpjuxlLaL3fWkLFAQmhVH+Al4ezgvp9lf6n4qFXOOFR9s+0on4QgkTPmf 2RTfPLDGClvsOL9HQANMvUV931dJF+oJmoSWnJuIcTFyEconNSBVyzBJVlZeDj6idxt2 5rpGLRXOBKgcFkff8hRSLbkU5cYkdRKGPINBfSzinQOz040Yvwa/Avzn+Rc6WgQZQ0bd XbPA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:message-id:mime-version:subject:date :in-reply-to:cc:to:references; bh=rHInDh+vUSPUTwgrfIn+5wJ305zDq7/TptP6mQlkG5E=; b=LvYlEHTlSIGqmuIkuf767WCQeWjhdo+oyO7oTW8gsRPXHx0FXX9OMjTkx04WqFHIro LKdSHAyTE9s8B6Bd9KRvkp9P58Yc8onOAheoHxy7cCIL+ikiVcLIKuySNCwTYI7T5mmf h2r+zAyi2RqzgKock9JUTj7ncjXkam0omLxfwxEAEzQNPP3FzCrMmuEb2b5onJVteciC VNoZILcBefIxs0zJRFnDFWRlh6bN0axiRThnsT/8T8wpqaTIuDydfWgsCvQaOsvVK7Rp yNk4YLRSXW4hpqIkqoJoTk6vwEZ9vHA0PV7rluzGk718ajRvT/ja2W2jSFavzFRw81eV 4CpA==
X-Gm-Message-State: AOAM530D0GrgxnXPuxG2Bx0V4iMuu8Pn6wIaA2x76dAS09PByaPgwAUI h9FKwUl6o7bnMvm0PYvn5hY=
X-Google-Smtp-Source: ABdhPJzrnQNQxyo3J2Jch6H33QAMqVlDhVoUEpN8MGm+Hgf8FD2xsdKBkSH5VpfRit7tJ8ByOArLIA==
X-Received: by 2002:a7b:c5d6:: with SMTP id n22mr19002310wmk.70.1613988899325; Mon, 22 Feb 2021 02:14:59 -0800 (PST)
Received: from [192.168.8.102] ([148.252.129.182]) by smtp.gmail.com with ESMTPSA id d20sm30186080wrc.12.2021.02.22.02.14.58 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Feb 2021 02:14:58 -0800 (PST)
From: Stewart Bryant <stewart.bryant@gmail.com>
Message-Id: <F09BD015-3AC2-4A07-9EAE-DCD2DC00D418@gmail.com>
Content-Type: multipart/alternative; boundary="Apple-Mail=_D7BFCA92-E2F2-4F40-8FD7-A70D53A99EA6"
Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\))
Date: Mon, 22 Feb 2021 10:14:57 +0000
In-Reply-To: <MN2PR05MB59816A0683CD84266BDB2059D4849@MN2PR05MB5981.namprd05.prod.outlook.com>
Cc: Stewart Bryant <stewart.bryant@gmail.com>, "int-area@ietf.org" <int-area@ietf.org>, mpls <mpls@ietf.org>, "pals@ietf.org" <pals@ietf.org>, Kireeti Kompella <kireeti@juniper.net>, Ronald Bonica <rbonica@juniper.net>, "<rtg-ads@ietf.org>" <rtg-ads@ietf.org>
To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
References: <MN2PR05MB59813CFC28F62CC076364991D4AA0@MN2PR05MB5981.namprd05.prod.outlook.com> <F30F0C17-39A6-4D43-AC94-727BC2C9EEC4@gmail.com> <MN2PR05MB59817B1DBD97C4CDEAFF6CDBD4849@MN2PR05MB5981.namprd05.prod.outlook.com> <MN2PR05MB59816A0683CD84266BDB2059D4849@MN2PR05MB5981.namprd05.prod.outlook.com>
X-Mailer: Apple Mail (2.3608.120.23.2.4)
Archived-At: <https://mailarchive.ietf.org/arch/msg/pals/2x0CMD26DEmaadAuiBwNeJbeOG4>
Subject: Re: [Pals] draft-zzhang-intarea-generic-delivery-functions
X-BeenThere: pals@ietf.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: "Pseudowire And LDP-enabled Services dicussion list." <pals.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/pals>, <mailto:pals-request@ietf.org?subject=unsubscribe>
List-Archive: <https://mailarchive.ietf.org/arch/browse/pals/>
List-Post: <mailto:pals@ietf.org>
List-Help: <mailto:pals-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/pals>, <mailto:pals-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 22 Feb 2021 10:15:04 -0000

The DetNet CW is described in RFC8964 and is 



      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
     |0 0 0 0|                Sequence Number                        |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                       Figure 5: DetNet Control Word

In all defined control words

The 0000 is simply ECMP defeat and has no other purpose.

0001 means ACH 

An ACH is currently defined not to carry service/user data - it is a control/OAM channel.

You cannot assume anything about a payload starting 0000.

In MPLS the bottom label (alone) defines how you process the payload. So you know that you have a CW from the bottom label and by no other means.

In other words the the FEC of the bottom label and its associated parameters are the way that signalling protocol knows what instructions to give the forwarder, and the way that the forwarder knows what to do with the packet is from the instructions associated with the BoS label. This is the universal model for MPLS including for IP packets.

Stewart


> On 19 Feb 2021, at 15:42, Jeffrey (Zhaohui) Zhang <zzhang@juniper.net> wrote:
> 
> Hi Stewart,
> 
> I still have to read more about DetNet, but I am not sure if there is a real contention with PALS.
> 
> My understanding of 0000 nibble in PW control world is that it is only to prevent a transit node from mistaking the payload as IP. Is it supposed to indicate that any payload starting with 0000 is PW payload? I hope not.
> 
> Use of 0000 nibble in GDFH is also just to prevent transit nodes from mistaking it as IP. It does indicate it is GDFH. It should be able to co-exist with PW CW.
> 
> Thanks.
> Jeffrey
> 
> -----Original Message-----
> From: Jeffrey (Zhaohui) Zhang
> Sent: Thursday, February 18, 2021 10:35 PM
> To: Stewart Bryant <stewart.bryant@gmail.com>
> Cc: int-area@ietf.org; mpls <mpls@ietf.org>rg>; pals@ietf.org; Kireeti Kompella <kireeti@juniper.net>et>; Ron Bonica <rbonica@juniper.net>et>; <rtg-ads@ietf.org> <rtg-ads@ietf.org>
> Subject: RE: draft-zzhang-intarea-generic-delivery-functions
> 
> Stewart, all,
> 
> I apologize for not responding to this in time. I some how accidentally moved a few wg mailing list email folders to a place where I could not see so I missed all the discussions.
> Let me catch up all the emails and then reply.
> 
> Thanks.
> Jeffrey
> 
> -----Original Message-----
> From: Stewart Bryant <stewart.bryant@gmail.com>
> Sent: Tuesday, January 12, 2021 9:59 AM
> To: Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
> Cc: Stewart Bryant <stewart.bryant@gmail.com>om>; int-area@ietf.org; mpls <mpls@ietf.org>rg>; pals@ietf.org; Kireeti Kompella <kireeti@juniper.net>et>; Ron Bonica <rbonica@juniper.net>et>; <rtg-ads@ietf.org> <rtg-ads@ietf.org>
> Subject: Re: draft-zzhang-intarea-generic-delivery-functions
> 
> [External Email. Be cautious of content]
> 
> 
> Thank you Jeffery
> 
> Please see the note that I sent about iOAM who also want to sit after BoS … and both of you want the same space that PALS and DetNet is already using.
> 
> We plan to have a joint session on this hosted by PALS at the next IETF, but I think we also need to include the iOAM people.
> 
> This has scope to get very messy as we find new candidates for BoS metadata so we really need to take a holistic position to ensure the future health the MPLS protocol.
> 
> - Stewart
> 
> 
>> On 12 Jan 2021, at 14:27, Jeffrey (Zhaohui) Zhang <zzhang@juniper.net> wrote:
>> 
>> Hi,
>> 
>> I just posted https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-zzhang-intarea-generic-delivery-functions/__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b9MseV-Y$ .
>> 
>> The initial version was posted to the tsvwg (https://urldefense.com/v3/__https://tools.ietf.org/html/draft-zzhang-tsvwg-generic-transport-functions-00__;!!NEt6yMaO-gk!QyBnufJO58LP6Diq96EdYEe2kxFtiItOdNuXbu_RIMekK2pkpOj4Mmj7b5lS_Jea$ ). After discussions/feedback we are re-homing it to intarea wg. This new version also contains quite some changes based on the comments and feedback that we received (special thanks to Stewart).
>> 
>> Comments and suggestions are appreciated.
>> 
>> Thanks.
>> Jeffrey
>> 
>> Juniper Business Use Only
> 
> 
> Juniper Business Use Only